cki-pipeline/bot: support negative regexes for variable filtering
For kernel-ark, the clang and clanglto pipelines are nearly the same but the rpmbuild_with variable, which contains clang_lto for the clanglto pipelines.
To make it possible for the bot to selectively ignore clanglto pipelines, support a {not: regex} syntax next to the positive regex matches.
[skip coverage check]
Part of kernel-ark#117 (closed)
Edited by Michael Hofmann